20．She was seated quickly at the desk，her attention ______ on the smartphone．（　　）
A．fixedB．fixingC．to fixD．to be fixed

分析 她迅速地坐在桌子旁，注意力集中在手機(jī)上．

解答 答案：A
分析句式可知，主句為"She was seated quickly at the desk"，后面的是表示伴隨狀況，"attention"與"fix"之間表示被動(dòng)關(guān)系，此處構(gòu)成一個(gè)獨(dú)立主格結(jié)構(gòu)，即主語+現(xiàn)在分詞（主動(dòng)）或過去分詞（被動(dòng)）．

點(diǎn)評(píng) 考查過去分詞．考生需對(duì)過去分詞的用法熟悉，即與所修飾的名詞之間表示被動(dòng)關(guān)系．

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